BS ISO 965-1-2013 + A1-2021 PDF

Full title and description

STB BS ISO 965-1-2013 + A1-2021 — ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data (edition 4, 2013) with Amendment 1 (2021). This listing indicates the base ISO 965-1:2013 international standard together with its 2021 amendment as adopted/published in national formats (STB / BS prefixes as applicable).

Abstract

ISO 965-1:2013 specifies the tolerance system and the underlying principles and basic data for ISO general purpose metric screw threads (designation M) — i.e., the definitions, fundamental deviations, tolerance grades and application rules that are used to determine limits and fits for external and internal metric threads. Amendment 1 (2021) makes targeted updates to this part without replacing its core principles.

General information

• Status: Published (base standard ISO 965-1:2013) with published Amendment 1:2021; a new edition of ISO 965-1 has been progressed by ISO.
• Publication date: Base edition published September 2013; Amendment 1 published September 2021 (national adoption dates may vary slightly by publisher).
• Publisher: International Organization for Standardization (ISO); also available as adopted by national bodies (BS, STB, etc.).
• ICS / categories: 21.040.10 — Metric screw threads; mechanical engineering components.
• Edition / version: Edition 4 (2013) + Amendment 1 (2021).
• Number of pages: Base part: 20 pages (ISO listing). Amendment 1 is a short amendment document (published separately; length varies by publisher / national reprint).

Scope

This part of ISO 965 establishes the tolerance system used for ISO general purpose metric screw threads (M series) in accordance with the basic profile defined in ISO 68‑1 and the general plan of preferred sizes in ISO 261. It provides principles, definitions, basic deviations and tolerance grades used to determine limits and fits for mating internal and external metric threads. The 2021 amendment updates specific numerical or editorial items while leaving the scope and application of the part unchanged.

Key topics and requirements

• Definition of the tolerance system for ISO general-purpose metric screw threads (M-series threads).
• Fundamental deviations and tolerance grades for internal and external threads (basis for limits of size and fits).
• Reference and consistency with basic profile (ISO 68‑1) and general plan / preferred sizes (ISO 261).
• Rules and examples for applying tolerances to select appropriate thread tolerance positions and classes.
• Amendment changes (2021): targeted corrections/clarifications to tables/notes and alignment with related parts of the ISO 965 series.

Typical use and users

Engineers and designers specifying metric threaded fasteners, manufacturing and quality-control engineers setting thread tolerances, inspection and metrology personnel, standards librarians, and procurement/specification authors in mechanical engineering, automotive, aerospace, construction and general manufacturing. National standards bodies and certification/ conformity assessment organizations also use this document when adopting or referencing metric thread tolerancing rules.

Related standards

Key related standards in the ISO metric-thread family include ISO 261 (General plan and preferred sizes for ISO metric screw threads) and ISO 68‑1 (Basic profile for metric screw threads); other parts of the ISO 965 series (e.g., ISO 965‑2, ISO 965‑3, ISO 965‑4) provide limits of size and specific applications for particular tolerance classes or surface treatments. These documents are routinely used together when specifying, producing and inspecting metric threads.

Keywords

ISO 965-1; metric screw threads; M threads; tolerances; fundamental deviations; tolerance grades; ISO 261; ISO 68-1; amendment 2021; thread limits; fasteners.

FAQ

Q: What is this standard?

A: ISO 965-1:2013 (with Amendment 1:2021) is the part of the ISO 965 series that defines the principles and basic data for the tolerance system applied to ISO general-purpose metric screw threads (M series).

Q: What does it cover?

A: It covers the tolerance system — including definitions, fundamental deviations, tolerance grades and application rules — used to determine limits and fits for mating internal and external metric threads, referencing the basic thread profile (ISO 68‑1) and the general plan of sizes (ISO 261).

Q: Who typically uses it?

A: Mechanical designers, fastener manufacturers, production engineers, quality and inspection personnel, procurement/specification writers, and standards committees/national adoption bodies. It is a practical reference for anyone who needs to specify or verify metric thread tolerances.

Q: Is it current or superseded?

A: The published base edition (ISO 965‑1:2013) with Amendment 1 (2021) remains a published and widely referenced document. ISO has progressed a new edition of ISO 965‑1 (replacement under publication at ISO), so users should confirm whether a newer consolidated edition has been published by ISO or their national body when absolute currency is required.

Q: Is it part of a series?

A: Yes — ISO 965‑1 is Part 1 of the ISO 965 series (tolerances for general-purpose metric screw threads). Other parts (for limits of size, special finishes, etc.) include ISO 965‑2, ISO 965‑3, ISO 965‑4 and related documents; they are intended to be used together when specifying thread tolerances and limits for particular classes and treatments.

Q: What are the key keywords?

A: Metric screw threads, M threads, tolerances, tolerance grades, fundamental deviation, ISO 965-1, ISO 261, ISO 68-1, amendment 2021.